Sounds good.

I thought it'd be something along those lines. But to make it user friendly you do also need to have fetching the location using GPS, and probably also options to always fetch it by GPS (daily I'd imagine), and an option to do one time fetch in UI and use that for location so that GPS activation can be avoided. Also if it's to be a condition, I think it'd useful that users can specify for example "15 minutes after sunrise" or "an hour after sundown" just to give an example.

So while I think the individual pieces are probably not anything very complex, I do think it will take a bit time to do all the bits and pieces correctly, and the testing involved. So it's not something I can right now use time for, but maybe later in year.